Damping properties of composite sandwich plates with negative Poison’s ratios (NPRs) under free conditions were studied experimentally and numerically in this paper. In order to gain the components of damping loss factor (DLF) of parent material, modal testing of three unidirectional laminates was conducted. Laminates were manufactured by hot-press technology, and plates with three relative densities (RDs) were fabricated using hot-pressing method and secondary formed technology. The DLFs of composite honeycomb plates were calculated by modal strain energy method in numerical study and compared with those gained from tests. Effects of relative density on modal characteristics of plates were discussed by experiment and finite element method (FEM). Parameter analyses were conducted numerically. Vibration response of composite honeycomb plates was discussed by FEM. Results revealed that FEM reflected modal characteristics of composite plates effectively. Frequencies of composite plates raised when angle of unit cells improved. Increasing the angle could enhance DLF and reduce the vibration response of composite honeycomb plates with same RD.
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